// Problem: 
// Contest: 
// URL: 
// Memory Limit: 
// Time Limit: 
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#include<bits/stdc++.h>
using namespace std;
#define int long long
inline int read(){
	int s=0,w=1;
	char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')w=-1;ch=getchar();}
	while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
	return s*w;
}
signed main()
{
	int t=1;
//	cin>>t;
	while(t--)
	{
		int w,m,n;
		cin>>w>>m>>n;
		int x1,y1,x2,y2;
		if(m%w)x1=m/w+1;
		else x1=m/w;
		if(n%w)x2=n/w+1;
		else x2=n/w;
		if(x1%2==1)y1=m%w==0?w:m%w;
		else y1=m%w==0?1:w-m%w+1;
		if(x2%2==1)y2=n%w==0?w:n%w;
		else y2=n%w==0?1:w-n%w+1;
		//cout<<x1<<y1<<x2<<y2<<endl;
		cout<<abs(x2-x1)+abs(y2-y1);
	}
	return 0;
}
